111621689 has 2 divisors, whose sum is σ = 111621690. Its totient is φ = 111621688.

The previous prime is 111621661. The next prime is 111621701. The reversal of 111621689 is 986126111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90535225 + 21086464 = 9515^2 + 4592^2 .

It is a cyclic number.

It is not a de Polignac number, because 111621689 - 2¹⁶ = 111556153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111621619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55810844 + 55810845.

It is an arithmetic number, because the mean of its divisors is an integer number (55810845).

Almost surely, 2^111621689 is an apocalyptic number.

It is an amenable number.

111621689 is a deficient number, since it is larger than the sum of its proper divisors (1).

111621689 is an equidigital number, since it uses as much as digits as its factorization.

111621689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 35.

The square root of 111621689 is about 10565.1166108094. The cubic root of 111621689 is about 481.4851124415.

The spelling of 111621689 in words is "one hundred eleven million, six hundred twenty-one thousand, six hundred eighty-nine".